From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "Gabriel L. Somlo" <gsomlo@gmail.com>,
Alex Williamson <alex.williamson@redhat.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"eddie.dong@intel.com" <eddie.dong@intel.com>,
Alexander Graf <agraf@suse.de>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [PATCH RFC] kvm: ignore apic polarity
Date: Fri, 28 Feb 2014 09:10:53 +0100 [thread overview]
Message-ID: <5310448D.3020400@redhat.com> (raw)
In-Reply-To: <20140228045524.GB29585@redhat.com>
Il 28/02/2014 05:55, Michael S. Tsirkin ha scritto:
> Why?
>
> We already have different ACPI tables for TCG vs KVM.
> Specifically apic interrupt override flag in MADT is set
> for KVM but not TCG.
It used to be this way, but
bool kvm_allows_irq0_override(void)
{
return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
}
means that these days it is usually set for both TCG and KVM.
> As KVM hardware differs from TCG, I expect them to move
> further apart with time.
I don't expect this, because there are some kind of guests that people
will unknowingly end up running with TCG---for example libguestfs. So
minimizing the differences in hardware between KVM and TCG _is_ a goal.
> Or we can do a patch like we did for kvm and ignore polarity,
> treating levels as logical rather than physical.
Yes.
Paolo
next prev parent reply other threads:[~2014-02-28 8:10 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20140130204423.GK29329@ERROL.INI.CMU.EDU>
2014-02-11 18:23 ` RFC: ioapic polarity vs. qemu os-x guest Gabriel L. Somlo
2014-02-11 19:54 ` Michael S. Tsirkin
2014-02-11 21:35 ` Gabriel L. Somlo
2014-02-14 21:13 ` Gabriel L. Somlo
2014-02-14 21:21 ` Alexander Graf
2014-02-14 22:06 ` Gabriel L. Somlo
2014-02-14 22:13 ` Alexander Graf
2014-02-16 11:18 ` Michael S. Tsirkin
2014-02-16 11:41 ` Michael S. Tsirkin
2014-02-16 14:47 ` Alex Williamson
2014-02-16 16:23 ` Michael S. Tsirkin
2014-02-17 17:57 ` Gabriel L. Somlo
2014-02-17 18:01 ` Gabriel L. Somlo
2014-02-17 18:06 ` Paolo Bonzini
2014-02-17 19:38 ` Gabriel L. Somlo
2014-02-18 0:58 ` Gabriel L. Somlo
2014-02-27 17:05 ` [PATCH RFC] kvm: ignore apic polarity Michael S. Tsirkin
2014-02-27 21:41 ` Gabriel L. Somlo
2014-02-27 22:30 ` Paolo Bonzini
2014-02-27 23:13 ` Gabriel L. Somlo
2014-02-27 23:31 ` Paolo Bonzini
2014-02-28 4:06 ` [RFC PATCH v2] kvm: x86: ignore ioapic polarity Gabriel L. Somlo
2014-03-02 14:55 ` Michael S. Tsirkin
2014-03-13 10:53 ` Paolo Bonzini
2014-03-13 13:43 ` Gabriel L. Somlo
2014-02-28 4:55 ` [PATCH RFC] kvm: ignore apic polarity Michael S. Tsirkin
2014-02-28 8:10 ` Paolo Bonzini [this message]
2014-02-28 8:11 ` Paolo Bonzini
2014-03-01 5:03 ` Alex Williamson
2014-02-16 11:34 ` RFC: ioapic polarity vs. qemu os-x guest Michael S. Tsirkin
2014-02-16 15:12 ` [Qemu-devel] " Peter Maydell
2014-02-16 11:37 ` Michael S. Tsirkin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5310448D.3020400@redhat.com \
--to=pbonzini@redhat.com \
--cc=agraf@suse.de \
--cc=alex.williamson@redhat.com \
--cc=eddie.dong@intel.com \
--cc=gsomlo@gmail.com \
--cc=kvm@vger.kernel.org \
--cc=mst@redhat.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).